Marong map unit Dgg

Back to: A Land Capability Study of the Rural City of Marong

Map Unit:	Devonian granodiorite, drainage depression	Map Unit Symbol:	Dgg
		% of Study Area:	0.8

Land-form diagram for Marong map unit Dgg

General Description:

The major and minor drainage lines within this unit contain a mixture of uniform sands with clay and silt lenses and yellow duplex soils. Uniform sands are dominant in the major drainage depressions and have been described below. Yellow duplex soils occur in the minor drainage depressions. Tors occasionally outcrop within this unit.

Site characteristics:

Parent material age:	Devonian	Depth seasonal watertable:	> 1 0 m
Lithology:	Granodiorite	Potential recharge to groundwater:	Very High
Landform Pattern:	Undulating / Rolling low hills	Flooding risk:	High
Element:	Drainage depression	Drainage:	Moderately well drained
Slope common:	0%	Depth to hardrock:	> 1.50 m
Slope range:	0 - 2%
Rock outcrop:	> 2%

Major vegetation: Red Gum, Yellow Box, Buloke, Hedge Wattle, Wallaby Grass

Present land use: Grazing (major) recreation, native forest (minor)

Land degradation:	Water erosion		Wind erosion	Salting	Acidification
Land degradation:	Sheet/rill	Gully	Wind erosion	Salting	Acidification
Susceptibility	Low	High	High	Moderate	Moderate
Incidence	Low	Moderate	Low	Moderate	Low

Soil profile characteristics:

Permeability (measured - average, range):	8390 3940 - 12510 mm/day
Permeability (estimated):
Available water capacity:	350 mm H₂O
Linear shrinkage (B horizon):	5.9 %

Soil profile description:

A	0-19 cm	Dull yellowish brown (10YR 5/3) loamy sand, apedal, loose consistence, pH 6.0. Clear transition to
C	19-62 cm	Dull yellowish brown (10YR 5/3) sandy loam, apedal, loose consistence, pH 7.0. Gradual transition to
2A	62-86 cm	Greyish yellow brown (10YR 5/2) sandy loam, a few medium distinct red mottles, weak structure, subangular blocky peds 5-15 mm, rough fabric, moderately weak consistence, pH 7.4. Clear transition to
2B2	86-101 cm	Greyish yellow brown (10YR 5/2) light sandy clay loam, common distinct medium sized yellowish brown mottles, structureless, loose consistence, a few subangular fine quartz fragments, pH 7.8. Clear transition to
2B3	101-130 + cm	Brownish grey (10YR 5/1) silt loam, a few distinct fine yellowish brown mottles, weak structure, subangular blocky peds 10-20 mm, smooth fabric, moderately firm consistence, pH 7.4

Soil classification:

Factual Key (Northcote):	Uc (major), Dy3.41 (minor)
Australian Soil Classification:	Brown, Arenic, Rudosol; very deep, medium, sandy, non-gravelly
Unified Soil Group:	SM

Interpretation of soil analyses*

Horizon	pH	Gravel %	E.C. (salts)	Nutrient Status	P	K	Al	Organic Matter	Dispersibility
A	6.0	< 1	VL	VL	D	S	S	L	L
C	7.0	< 1	L	VL	D	S	S	L	L
2A	7.4	0.4	L	VL	D	D	S	L	L
2B2	7.8	29.7	VL	L	D	D	S	L	L
2B3	7.4	2.2	VL	L	D	S	S	M	H

VL : Very Low; L : Low; M : Moderate; H : High; VH : Very High; D : Deficient; S : Satisfactory; T : Toxic; **: Acid * See Appendix 4 for analytical results

Land capability assessment

Land Use	Class	Major limiting feature(s)/ landuse
Agriculture (CTS values)	C₃T₁S₅	High seasonal watertable
Effluent disposal (septic tanks)	5	High seasonal watertable, high risk of flooding, excessive permeability – risk of polluting groundwater and adjacent streams
Farm dams (earthen)	5	High seasonal watertable, excessive permeability
Building foundations - slab	5	High seasonal watertable, high risk of flooding
Building foundations - stumps/footings	5	High seasonal watertable, high risk of flooding
Secondary roads	5	High risk of flooding
Urban residential	5	Secondary roads, building foundations
Rural residential	5	Farm dams, effluent disposal, secondary roads, building foundations.

The high resolution PDF file provided on this page can be viewed using the free Adobe PDF reader, this software can be installed for free from the Adobe website (external link).

A Land Capability Study of the Rural City of Marong - map unit Dgg - (PDF - 38 KB)

Page top